According to the latest Fortnite leaks, a collaboration with One Piece is in the works. The information comes from Shpeshal_Nick and @xboxera, the same source that mentioned the Teenage Mutant Ninja Turtles and the Doom Slayer collaborations.
These Fortnite leaks were posted on social media by several leakers/data-miners such as ShiinaBR, iFireMonkey, and even Hypex. While details about this potential crossover remain obscure, it will be on a grand scale for sure.
Given the scale and size of the One Piece fandom, Epic Games will go all out; they will probably follow the same pattern as past anime collaborations. Certain items/weapons/abilities from the One Piece franchise will be added to the loot pool.
There is a possibility that the One Piece collaboration will feature its own Landmark/Named Location — The Going Merry is the likely choice for this.
Although these Fortnite leaks provide some tangible evidence that a One Piece collaboration is in development, there is no timeline in place. The One Piece collaboration could happen sooner than expected - perhaps towards the end of Fortnite Chapter 5.
Keeping aside One Piece, Shpeshal_Nick and @xboxera mentioned that other collaborations are planned as well. They included some major names, and a few of them were rumored to be in development not too long ago.
Switch 2 Reportedly Coming This Year With 8-inch LCD Screen, Claims Analyst